Sears had designed the tractor with such small gaps between these components that there was a fine spot for cut grass to get lodged and then ignited by the hot muffler. I calmly shifted into neutral and got off the seat, shutting down the engine. I kicked the burning grass off the tractor and stomped it out. Unfortunately, grass had caught fire under the tractor. I pushed it out of the way to stomp the flames. Then there was a small fire where the tractor had originally been stopped. I went back for that one. Then things got real interesting. There was still more burning grass under the tractor. Sears designers, in their infinite wisdom, had run the fuel line, a 1/4" unprotected rubber tube, under the frame. It didn't take much time for the fire to melt the tubing, adding 3 gallons of gasoline to the mix. That's when I ran to the house to get my wife to call 911. After a friend and the volunteer fire department helped me put out the fire, I had lost 1 tractor, about 1/2 acre of grass, and 100 feet of plastic fence. Sears wouldn't even answer my letters. Eventually they responded to let me know that they were in no way at fault, that there was nothing at all wrong with their design. When I asked one of their lackeys at headquarters why, if there were not a problem, they had changed the exhaust routing on all their small tractors the next model year (I went to a Sears store to confirm it), this person said they had not made any changes at all. My letter telling her she was either an idiot or a liar went unanswered.